Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #4 Oct 28 2013 08:17:40
%S 1172,21076,1025430,17497342,801845362,13663471254,625553036008,
%T 10652997961328,487784854592488,8305829325372360,380324726478587580,
%U 6475874805604555424,296532282288946047888,5049115344840115896488
%N Number of (n+3)X(6+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero
%C Column 6 of A230708
%H R. H. Hardin, <a href="/A230706/b230706.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=2
%e ..0..x..0..x..0..x..1..x..1....0..x..0..x..1..x..1..x..2
%e ..x..1..x..1..x..2..x..2..x....x..1..x..2..x..2..x..0..x
%e ..0..x..2..x..1..x..0..x..1....2..x..1..x..0..x..2..x..1
%e ..x..1..x..0..x..0..x..1..x....x..0..x..2..x..1..x..2..x
%e ..0..x..2..x..2..x..2..x..0....2..x..2..x..0..x..0..x..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 28 2013